Robot arms are one of the most popular DIY projects you’ll find online. When we sat down to design our version of an Arduino robot arm, we decided to take on a challenge and create it out of recycled materials. The way we see it, being a maker, also means thinking out of the box and asking yourself how to utilize different materials that are available to you, without producing more waste. Using pieces of scrap wood and some plastic bottles, we put together the body of the robot arm. We made heat shrinks out of plastic bottles with a neat technique we learned online, and used a potato (!) as a weight so the robot wouldn’t tip over.
This project was a lot of fun for us, as it reminded us why we love making so much.
Note: In the video you’ll see an earlier version of circuito.io, therefore, it’s best to follow the steps in the tutorial.
See the wiring diagram below, or click here >>
Start the build with a solid base so that the arm doesn’t tip over. At the same time we also need to understand what would be the best way to bind and tie the pieces of wood together so that the base is solid.
In the image below you can see the way we used the heat-shrinks and a potato (!) as a base as the weight. Just don’t forget to replace it from time to time
Placing the second servo was more tricky and we feel that this area still needs some attention. We realized, after building the prototype, that we hadn’t given enough thought to balancing the upper arm. Therefore, the servo motor draws a lot of current – something that can be overcome by using a counterweight on the opposite side of the arm.
There are different types of grippers we considered, and we weren’t really sure what we’re going to do here. Eventually, we decided to make one side of the gripper static so that it will have a strong grip. As you can see in the image below, for the moving part we made a joint, that is controlled by the servo and added a spring for closing and opening.
Eventually, we placed some string inside an elastic tube to connect between the servo motor and the gripper, the same mechanism that you can find in bicycle brakes.
That’s basically it! You’ll probably need to make minor tweaks and changes to the code and mechanics according to the material and electronics you use. If you have any insights or comments, we’d love to hear them! Share them with us on our forum.
We’ll finish with the words of Adam Savage in his famous “10 Commandments for Makers”:
Don’t wait. You can start now with what’s in front of you. As Goethe [may or may not have] said, “Begin it!”